Improvement in adding



M.\W. CLAY. Adding-Machine.

Paented Aug. 20,1878.

llllllllllllllll.

INVENTOR @a/M l f? dwf/. Maz/L ATTORN EYS UNTTED STATES PATENT OFFICE.

MARK IW. CLAY, OF ORONOCO, MINNESOTA.

IMPROVEMENT 5N ADDING-MACHINES.

Specilication forming parl' of Letters Patent No. Q, dated Amrust 20,1878; application liled January 16, 1878.

To all whom it may concer-n:

` Be it known that I, MARK W'. CLAY, of Oronoco, in the county ofOlmsted, and in the State of Minnesota, have invented certain new anduseful Improvements in Addie g-Machines; and do hereby declare that thefollowing' is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangementot' an addingmachine, asn'ill be hereinafter more fully set forth. Y. YY

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruct-ion and operation, referring to the annexed drawing', inwhich- Figure 1 is a front view ot' v my machine. Fig. 2 is a sideelevation of the same, and Fig.

I 3 is a detailed vievv ot' a part ot' one ot' the wheels. Y

" A represents a frame, through which passes a horizontal shaft, B, withpointer, C, on its front end. This pointer is provided with a knob orhandle, C', for turning the same, and

the pointer Works on a dial, D, on the front ot the frame. On the shaftB is securely fastened one wheel, G, and loosely placed one or moreWheels, G. These Wheels are all con structed alike, their rims beingT-shaped. 0n one side'the rim is formed with one hundred cogs, a, and onthe other side is a notch, b, in the rim, as Well as aprojecting pin, d,immediately in advance of said notch.

For each revolution of the first Wheel, G, its pin d strikes a pin, e,projecting from a pinion, H, placed upon a vertical stud, f, and thiscauses one of the cogs of said pinion to take into the notch b, and thepinion will thus be turned the distance of one of its cogs.

The pinion H has a pin, e, for each ot its teeth or cogs, and it is alsoprovided with a smaller pinion, I, which turns with it. This latterpinion, I, meshes with a pinion, J, which, in turn, gears with the cogscon the rst loose Wheel, G. This wheel is in like manner connected withthe second loose wheel, and so on as many Wheels as may be desired.

The parts are so arranged that for every revolution of the Wheel G thefirsty loose Wheel, G', will be turned the distance of one of its eogs,and for every revolution of the first loose wheel the second loose Wheelwill be turned the distance ot' one of its cogs, and so on throughoutthe series.

The dial D is numbered from l to 100, and

. the peripheries of the loose Wheels are nuin bered in like manner,these latter numbers bcing seen, one by one, through suitable openingsin the top ot' the frame A.

The pinion J is mounted on a vertical rod, h, which is placed in aframe, K, and arranged with a spring, i', to hold the pinion J down ingear with the pinion I and the adjacentwheel.

By lifting the rod 7i the pinion J is also lifted ont of' gear, when.the wheel can be set at once as required to commence a calculation.This is of great importance, as it saves considerable time. y

Having thus fu'lly described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In an adding-machine, the combination of the Wheel G, provided withthe notch b and pin d, the pinion H, with pins e, the pinions I d, and.the Wheel G', substantiallyr as and for the purposes herein set forth.

`2. The combination ot' the frame K, rod le,

MARK "W, CLAY.

Witnesses WM. D. ALEXANDER, I. F. CLARK.

pinion J, and spring i with the pinion I and

